Precision core for paper rolls



Nov. 16, 1954 s. E. sTlNGLE ETAL PRECISION CORE FOR PAPER ROLLS Filed Feb. 26. 1952 S1 www erzus e ytllarence 0.3;?9 le&

United States PatentCice 2,694,534 Patented Nov. 16, 1954 PRECISION CORE FOR PAPER ROLLS Sylverius E. Stingl-e, Sherwood, and Clarence O. Stingle, Appleton, Wis.

Application February 26, 1952, Serial No. 273,512

1 Claim. (Cl. 242-68) This invention relates to cores or spools for rolls of sheet material, such as paper, and more particularly to such a core formed of moldable material to precise dimensions and adapted to be mounted on the roll supporting shaft of a cash register, adding machine or other device using strips of sheet material in rolled condition.

It is among the objects of the invention to provide an improved core or spool for a paper roll which is of hollow, cylindrical shape and formed of moldable material to precise dimensions; which is provided with reinforcing internal ribs and end walls or anges; which may be provided in different colors and stamped or imprinted with advertising or other material at the time of manufacture; and which is simple and durable in construction, economical to manufacture, of light weight and high structural strength, and neat and attractive in appearance.

Other objects and advantages will become apparent from a consideration of the following description and the appended claim in conjunction with the accompanying drawing wherein:

Figure l is a perspective view of a roll of sheet material rolled on a core illustrative of the invention;

Figure 2 is a side elevational view of the core;

Figure 3 is an end view of the core looking at the lefthand end of the core as illustrated in Figure 2;

Figure 4 is an end view of the core looking at the righthand end as illustrated in Figure 2;

Figure 5 is a longitudinal cross sectional view on the line 5--5 of Figure 2;

Figure 6 is a transverse cross sectional view on the line 6 6 of Figure 2; and

Figure 7 is a fragmentary cross sectional View on the plane of the section of Figure 5 on an enlarged scale and showing structural details of the invention.

With continued reference to the drawing, the core is formed from a readily moldable material, such as a suitable thermoplastic or thermo-setting plastic material and comprises an outer shell 10 of cylindrical shape having a length substantially equal to the width of the roll 11 of sheet material to be carried thereon, end walls 12 and 13 disposed one at each end of the shell 10 and ribs 14 eX- tending longitudinally of the shell within the latter and between the end walls 12 and 13.

The shell 10 has a wall thickness which is a small fractional part of the radial dimension of the shell and the end walls 12 and 13 have a thickness approximately the same as the wall of the shell.

The end walls 12 and 13 are provided with centrally disposed apertures and 16 respectively, of circular shape, and of a size to closely receive the roll supporting shaft of a machine, such as a cash register or adding machine, and the ribs 14 have a thickness approximately the same as the thickness of the wall of the shell and a width substantially equal to the radial distance from the apertures 15 and 16 to the inner surface of the shell. The ribs are spaced apart around the inside of the shell at substantially equal angular intervals, the four ribs shown in the accompanying drawing being spaced apart at angular intervals of approximately 90 degrees, and are joined at their opposite ends to the inner sides of the end walls 12 and 13.

In the manufacture of the device the ribs are slightly beveled on their inner edges, adjacent one end of the spool, as indicated at 17, and terminate short of the adjacent end of the shell by an amount substantially equal to the thickness of the end walls. During manufacture, the shell, ribs and end wall 12 are molded as a single unit,

the mold core being inserted through the end of the shell at which the end wall 13 is disposed, this end Wall being omitted at this time for the insertion of the mold core into ghe hollow body and the removal of the mold core thererom.

The end wall 13 is formed separately and after the mold core has been withdrawn from the formed hollow body, the end wall is inserted in place against the adjacent ends of the ribs 14, suitable cement being placed around the peripheral surface of this end wall and on the ends of the ribs 14 to provide a bond 18 between the end wall 13 and the shell 10 and ribs 14, thus making the end wall 13 substantially integral with the remainder of the body.

It is to be noted that the inner periphery of the end wall 13 is disposed radially inwardly of the adjacent portions of the beveled inner edges 17 of the ribs 14. By virtue of this arrangement of the inner periphery of the end wall 13 with respect to the beveled inner edges 17 of the ribs 14 a circumferential inwardly opening recess in the shell is dened which recess, taken with the inner periphery of the aperture in the end wall 13. facilitates measurably the mounting of the core upon a spindle for rotation.

A plastic material can readily be selected which does not change its dimensions after molding nor because of moisture or temperature variations of the atmosphere and, by providing accurately dimensioned molds, cores can be provided which are accurate and precise as to their various dimensions and will remain accurate as to dimensions and free of warping or distortion. The cores may be provided of differently colored material and the different colors may be utilized, if desired, to indicate diiferent qualities or other characteristics of the sheet material strips wound thereon. Also, suitable advertising or other material may be stamped or imprinted into the material of the cores while the material is in a plastic condition during the molding thereof.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claim rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claim are, therefore, intended to be embraced therein.

What is claimed is:

A core for a roll of sheet material comprising: a thinwalled, hollow, cylindrically shaped shell having a constant inner and outer diameter from end to end thereof; a first end wall on one end of the shell having an aperture concentric with the shell; a series of radial ribs extending longitudinally of and within the shell from said end wall to a location short of the other end of the shell by a distance substantially equaling the thickness of the shell wall, to define a circumferentially extending, inwardly opening recess in said other end of the shell, said ribs being coextensive in width for a substantial part of their lengths with the radial distance between said aperture and the end shell wall, the ribs decreasing progressively in width over the remaining parts of their lengths to said other ends of the ribs, said ribs, rst end wall, and shell being integrally formed from a moldable material; and a second end wall formed separately from said integrally molded ribs, first end wall, and shell and having a thickness equal to the depth of said recess, the second end wall being cemented in the recess and having an aperture aligned with the first named aperture longitudinally of the shell, the aperture of the second end wall being equal in diameter to the diameter of the rst named aperture, thus to dispose the inner periphery of the second end wall radially and inwardly of thbe shell from the adjacent, reduced-width ends of said r1 s.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 786,698 Wardwell Apr. 4, 1905 1,159,204 Forney Nov. 2, 1915 (Other references on following page) Number 3 UNITED STATES PATENTS Name Date Wermine ,.k Dec. 23, 1924 Fulton Jan. l14, 193.0 Beran Ooit. l'23 193-4 Kent May 2.3, `1939 Howsam Nov. 25, -1941 Markle, Jr. Mar. k26, -1946 Morf Apr. 22, 1947 Number 4: FOREIGN PATENTS Country Date France Dec. 16, 1926 Germany Apr. 19, 1929 

